Mining-machine.



(No Model.)

H. C. SEBGEANT. MINING MACHINE.

(Application filed Jan. 29, 1901.)

' Painmu Oct. I, I90L NlTED STATES PATENT QFFICE.

HENRY G. SERGEANT, OF VESTFIELD, NEW JERSEY, ASSIGNOR TO THE INGERSOLL-SERGEANT DRILL COMPANY, OF NEW YORK, N. Y.

MINING-MACHINE.

- SPECIFICATION forming part of Letters Patent No. 683,864, dated October 1, 1901.

Application filed January 29, 1901. Serial No. 45,202. (No model.)

T0 0% whom it may concern/.-

Be it known that I, HENRY O. SERGEANT, a citizen of the United States, and a resident of Westfield, in the county of Union and State of New Jersey, have invented a new and useful Improvement in Mining Machines, of which the following is a specification.

This invention relates generally to that class of mining-machines which may be used in various mining operations, but are especially adapted for the mining of coal and known as coal-picks, such a machine embodying a cylinder and a tool-carrying piston mounted on wheels and adapted to be run from place to place and toward its work by hand. Theimprovement relatesparticularly to brakes applied to the wheels of such a machine to prevent them from running backward; and it consists in the brake mechanism hereinafter described and claimed which permits the machine to be easily run forward, but which acts automatically to prevent it from running backward.

Figure 1 represents a side view of a miningmachine embodying my invention; Fig. 2, a rear view of the same; and Fig. 3, a detail view, which will be hereinafter explained.

Similar letters and numerals of reference designate corresponding parts in all the figures.

at is the drilling-cylinder, fitted with a piston, (not shown,) and the piston-rod b of which is furnished with a chuck c, which carries the drill or pick (I. This cylinder may be furnished with a valve of any suitable kind for controlling the operation of its piston and is provided on its side with trunnions e, which form the axles of the wheels f, on which the machine is supported. Attached to each side of the cylinder is a handle 5.

g is a rock-shaft, to which are fixedly attached the upwardly-projecting brake-dogs h,

of which there is one represented for each wheel. This rock shaft, which is parallel with the axis of the wheels f, is fitted to rock in hearings in the ends of radius-bars i, which are pivoted in any suitable manner to the ends of the trunnions, centrally to the latter, as indicated at 6. The said rock-shaft, which may be termed the brake-shaft, is also furnished with loose rollers adapted to run on the ground or on the same surface on which the wheelsfrun, the length of the said bars 1; being such that when the said rollers j are on the ground or floor the rock-shaft is under the rear portions of the wheelsf. At one side of the cylinder a hand-lever k is provided on the rock-sl1aft, and this lever is connected with one of the trunnions e by a spring min any suitable manner, the said spring being represented (see Fig. 1) as connected with the lever by a hook nand with the trunnion by a ring or yoke 0, which is shown detached in the side View, Fig. 3, encircling the trunnion. The said lever is also connected with the yoke 0 by a rod p, which is pivoted at its rear end to the lever and connected at its front end with the yoke 0 by a pin q, affixed to the yoke and passing through a slot 1' in the rod. This slot permits the drawing back of the lever to an extent sufficient to withdraw the brakedogs from the wheels, but serves as a stop to limit this backward movement. The position of the dogs when in contact with the wheels is such that a line drawn through the center of the brake-shaft and through any point of contact between the dog and the'rim of the wheel will form an acute angle with the portion'of the rim below said point of contact. The springm always tends to draw forward the brake-dogs against the rims of the wheels; but when the machine is pushed or run forward by the handles 5 the friction between the wheels and the dogs tends to throw off the dogs, so that they present little or no obstacle to the forward movement; but on the recoil of the machine orits tendency to kick back or in case of any accidental tendency of the wheels to turn backward the friction between them and the dog is such as to draw the dogs toward the wheels, and so to chock them. On pulling back the leverby hand the dogs are withdrawn from the wheels and the machine is free to run backward. For running back the machine the operator may with one hand pull back the lever as far as permitted by the stop-pin q and then pull back with that hand remaining on the lever and the other hand on the handle 5 on the otherside of the machine. The rod 19 by limiting the backward movement of the lever prevents the overstraining of the spring.

Although I have shown the brake applied to both wheels, I should regard a brake applied to one wheel only as within the scope of my invention.

What I claim as my invention is 1. In a mining'machine which embodies a drilling-cylinder and wheels for supporting the same, the combination of a rock-shaft furnished with rollers adapted to run behind the said wheels on the same surface therewith, a brake-dog affixed to said rook-shaft, bars pivotally connecting said shaft with the said cylinder, and a spring applied to said shaft for drawing the brake-dog forward against a supporting-wheel, substantially as herein described.

2. In a mining-machine which embodies a drillingcylinder provided with trunnions and wheels for supporting the same, the combination of a brake-shaft furnished with rollers to run in rear of the said wheels, a brake on said shaft, bars pivotally connecting said shaft with the cylinder-trunnions, a lever on said shaft and a spring connecting said lever with one of said trunnions for drawing the brake toward the wheels, substantially as herein described.

3. In a mining-machine which embodies a drilling-cylinder provided wi th trunnions and wheels for supporting the same, the combination of a brakeshaft and rollers thereon adapted to run 011 the same surface with said wheels in rear thereof, a brake on said shaft, bars pivotally connecting said shaft with the cylinder-trunnions,a hand-lever on said shaft, aspring connecting said lever with one of the trunnions forpressing the brake to the Wheels, and a connection between said lever and the cylinder for limiting the movement of the hand-lever by which the brake is Withdrawn from the wheels, substantially as herein described.

4. The combination with the drilling-cylinder and its trunnions and the Wheels in which the trunnions-aresupported, of a rockshaft and rollers thereon arranged under the rear portions of said wheels, bars by which said shaft is pivotally connected with the trunnions and brake-dogs fixedly attached to said rock shaft and projecting upwardly therefrom against the lower rear portions of the wheels, substantially as herein described.

In testimony that I claim the foregoing as myinvention Ihave signed my name, in presence of two witnesses, this 28th day of January, 190].

HENRY G. SERGEANT.

\Vitnesses:

FREDK. HAYNES, LIDA M. EGBERT. 

